We got this as a 3rd birthday present for my son and he plays in it every day.  We unveiled it at his birthday party and there were about 5 kids playing in it at once.  It was a bit crowded but for every day with only 2 kids, it's perfect.  We haven't used the cover because we put it away too keep it from getting messed up and just don't think about it.  But constant play, exposure to elements and pets and it's held up very well for nearly a year and a half.  

Pros: Very sturdy. Perfect size, doesn't take up too much space but is big enough for play.
Cons: The sand gets in between the liner and the wood very easily.